120 lines
4.4 KiB
ReStructuredText
120 lines
4.4 KiB
ReStructuredText
.. _pre_launched_rt:
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Pre-Launched Preempt-Rt Linux Mode in ACRN
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##########################################
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The Pre-Launched Preempt-RT Linux Mode of ACRN, abbreviated as
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Pre-Launched RT mode, is an ACRN configuration scenario. Pre-Launched RT
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mode allows you to boot ACRN with a preempt-rt Linux running in VM0, and
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the Service VM running in VM1. VM0 and VM1 are both pre-launched VMs,
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and their resources are partitioned from those on the physical platform.
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.. figure:: images/pre_launched_rt.png
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:align: center
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Prerequisites
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*************
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Because the Pre-Launched RT VM and Service VM are physically isolated
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from each other, they must have their own devices to run a common OS,
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such as Linux. Also, the platform must support booting ACRN with
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multiple kernel images. So, your platform must have:
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- Two hard disk drives, one for the Pre-Launched RT and one for the Service
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VM
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- Two network devices
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- GRUB multiboot support
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Example of Pre-Launched RT
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**************************
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Take the Whiskey Lake WHL-IPC-I5 board (as described in :ref:`hardware`) for
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example. This platform can connect both an NVMe and a SATA drive and has
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two Ethernet ports. We will passthrough the SATA and Ethernet 03:00.0
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devices into the Pre-Launched RT VM, and give the rest of the devices to
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the Service VM.
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Install SOS With Grub on NVMe
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=============================
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As with the Hybrid and Logical Partition scenarios, the Pre-Launched RT
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mode must boot using GRUB. The ACRN hypervisor is loaded as a GRUB
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multiboot kernel, while the Pre-Launched RT kernel and Service VM
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kernels are loaded as multiboot modules. The ACRN hypervisor, Service
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VM, and Pre-Launched RT kernel images are all located on the NVMe drive.
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We recommend installing Ubuntu on the NVMe drive as the Service VM OS,
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which also has the required GRUB image to launch Pre-Launched RT mode.
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Refer to :ref:`gsg`, to
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install Ubuntu on the NVMe drive, and use grub to launch the Service VM.
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Install Pre-Launched RT Filesystem on SATA and Kernel Image on NVMe
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===================================================================
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Follow the :ref:`install-ubuntu-rtvm-sata` guide to install RT rootfs on SATA drive.
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The Kernel should
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be on the NVMe drive along with GRUB. You'll need to copy the RT kernel
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to the NVMe drive. Once you have successfully installed and booted
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Ubuntu from the NVMe drive, you'll then need to copy the RT kernel from
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the SATA to the NVMe drive:
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.. code-block:: none
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# mount /dev/nvme0n1p1 /boot
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# mount /dev/sda1 /mnt
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# cp /mnt/bzImage /boot/EFI/BOOT/bzImage_RT
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Build ACRN With Pre-Launched RT Mode
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====================================
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The ACRN VM configuration framework can easily configure resources for
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Pre-Launched VMs. On Whiskey Lake WHL-IPC-I5, to passthrough SATA and
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Ethernet 03:00.0 devices to the Pre-Launched RT VM, build ACRN with:
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.. code-block:: none
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make BOARD_FILE=$PWD/misc/acrn-config/xmls/board-xmls/whl-ipc-i5.xml SCENARIO_FILE=$PWD/misc/acrn-config/xmls/config-xmls/whl-ipc-i5/hybrid_rt.xml RELEASE=0
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After the build completes, please update ACRN on NVMe. It is
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/boot/EFI/BOOT/acrn.bin, if /dev/nvme0n1p1 is mounted at /boot.
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Add Pre-Launched RT Kernel Image to GRUB Config
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===============================================
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The last step is to modify the GRUB configuration file to load the Pre-Launched
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kernel. (For more information about this, see :ref:`Update Grub for the Ubuntu Service VM
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<gsg_update_grub>` section in the :ref:`gsg`.) The grub config file will look something
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like this:
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.. code-block:: none
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menuentry 'ACRN multiboot2 hybrid'{
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echo 'loading multiboot2 hybrid...'
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multiboot2 /EFI/BOOT/acrn.bin
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module2 /EFI/BOOT/bzImage_RT RT_bzImage
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module2 /EFI/BOOT/bzImage Linux_bzImage
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module2 /boot/ACPI_VM0.bin ACPI_VM0
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}
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Reboot the system, and it will boot into Pre-Launched RT Mode
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.. code-block:: none
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ACRN:\>vm_list
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VM_UUID VM_ID VM_NAME VM_STATE
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================================ ===== ================================ ========
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26c5e0d88f8a47d88109f201ebd61a5e 0 ACRN PRE-LAUNCHED VM0 Running
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dbbbd4347a574216a12c2201f1ab0240 1 ACRN SOS VM Running
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ACRN:\>
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Connect console of VM0, via 'vm_console' ACRN shell command (Press
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:kbd:`Ctrl` + :kbd:`Space` to return to the ACRN shell.)
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.. code-block:: none
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ACRN:\>vm_console 0
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----- Entering VM 0 Shell -----
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root@clr-85a5e9fbac604fbbb92644991f6315df ~ #
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